Joey99
Newbie
Hi everyone,
I have a 1993 GMC K1500 I bought with 160k miles a little while back, and it has an issue I have been totally unable to fix. My mechanical knowledge is pretty limited, but I figured this would be a good car to learn on.
When I first bought it, it would randomly stall at idle every once in a while. More recently, it stalled while idling and would not start back up until the engine had cooled down. Now, soon after the truck warms up it begins to run very rough, sputtering and surging, and acting like it will stall out while idling. The only code it's throwing is a code 45, a rich exhaust code.
So far I've replaced:
-catalytic converter (with an aftermarket one, was missing cat when I bought it)
-water pump (unrelated to issue)
-radiator (unrelated to issue)
-battery (unrelated to issue)
-icm
-iac
-temperature sensor x2
-tps
-map sensor
-pickup coil
-throttle body gaskets
-Pcv valve and hose
-oxygen sensor
-distributor cap and rotor
-spark plugs and wires
-ignition coil
-fuel filter
-I tested the fuel pump (I believe) correctly and it was within range.
-When I changed the pickup coil I set the timing back correctly
-Swapped out known working fuel injectors, same exact performance
-Swapped out known working ecm, same performance
-When I changed the spark plugs they were pretty black and sooty, clearly indicating a rich exhaust condition
I have a 1993 GMC K1500 I bought with 160k miles a little while back, and it has an issue I have been totally unable to fix. My mechanical knowledge is pretty limited, but I figured this would be a good car to learn on.
When I first bought it, it would randomly stall at idle every once in a while. More recently, it stalled while idling and would not start back up until the engine had cooled down. Now, soon after the truck warms up it begins to run very rough, sputtering and surging, and acting like it will stall out while idling. The only code it's throwing is a code 45, a rich exhaust code.
So far I've replaced:
-catalytic converter (with an aftermarket one, was missing cat when I bought it)
-water pump (unrelated to issue)
-radiator (unrelated to issue)
-battery (unrelated to issue)
-icm
-iac
-temperature sensor x2
-tps
-map sensor
-pickup coil
-throttle body gaskets
-Pcv valve and hose
-oxygen sensor
-distributor cap and rotor
-spark plugs and wires
-ignition coil
-fuel filter
-I tested the fuel pump (I believe) correctly and it was within range.
-When I changed the pickup coil I set the timing back correctly
-Swapped out known working fuel injectors, same exact performance
-Swapped out known working ecm, same performance
-When I changed the spark plugs they were pretty black and sooty, clearly indicating a rich exhaust condition